12" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 14 5/8" X 22 5/8"] Aluminum - Cube Core 10" x 4" Floor Register

10" x 4" Floor Register HVAC Air Supply Grille - Heavy Duty Rigid Built - Plastic Never Rust Vent Duct Cover

Actual Filter Size – 35 3/4"w x 33 3/4" x 1"

actual front end outer dimensions are approximately 30 5/8" width X 12 5/8" height

Actual Filter Size – 17 3/4"w x 23 3/4" x 1"

12" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - * Filter Included * [Outer Dimensions: 14 5/8" X 22 5/8"] Aluminum - Cube Core 10" x 4" Floor Register+ Product Details Size 12"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 14 5 8" width X 22 5 8" height Actual Filter Size 11 3 4"w x 19 3 4" x 1" High Quality High quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location Sidewall and ceiling Design Removable door face for easy filter change & cleaning uses a 1" thick filter.